PHILIP Seymour Hoffman died from a toxic mix of drugs including heroin and cocaine, a New York coroner has found.

The Oscar winning actor was found dead in his Manhatten apartment on February 2 with a needle sticking out of his arm. He was discovered by a friend after he failed to show up to pick up his three children.

News_Image_File: Drug cocktail ... Philip Seymour Hoffman at one of his last public appearances at the 2014 Sundance Film Festival. Picture: Splash

The New York medical examiner’s office said Hoffman died from a mix of heroin, cocaine, amphetamines and benzodiazepines, which are psychoactive drugs such as Librium.

The mixing of heroin and cocaine is known as speedballing - the same combination that killed comedian John Belushi and actor River Phoenix.

His dead was ruled an accident.

photo galleryPhilip Seymour Hoffman's greatest roles

Philip Seymour Hoffman's Greatest Roles1 of 12

Philip Seymour Hoffman ( left ) in the 1992 movie"Scent of a Woman".The film won three major awards at the Golden Globe Awards. Picture: Universal Pictures2 of 12

Philip Seymour Hoffman played the role of Scotty J in the 1997 movie Boogie Night. The film was nominated for three Academy Awards.3 of 12

In this undated publicity photo released by Sony Pictures Classics, Philip Seymour Hoffman portrays author Truman Capote in a scene from the film "Capote." Police say Oscar-winning actor Philip Seymour Hoffman has been found dead in his New York apartment Sunday, Feb. 2, 2014. He was 46. (AP Photo/Attila Doroy, Sony Pictures Classics)7 of 12

Philip Seymour Hoffman stars alongside Ryan Gosling in The Ides of March, a 2011 American political drama film directed by George Clooney. Picture: Columbia Pictures8 of 12

In this undated publicity photo released by Sony Pictures Classics, Philip Seymour Hoffman portrays author Truman Capote in a scene from the film "Capote." Police say Oscar-winning actor Philip Seymour Hoffman has been found dead in his New York apartment Sunday, Feb. 2, 2014. He was 46. (AP Photo/Attila Doroy, Sony Pictures Classics)

Philip Seymour Hoffman stars alongside Ryan Gosling in The Ides of March, a 2011 American political drama film directed by George Clooney. Picture: Columbia Pictures

Hoffman began renting the apartment after his long-time partner Mimi O’Donnell reportedly kicked him out of their apartment because of his US$10,000-a-month ($11,400) heroin habit, urging him to get himself sober.

The couple had three children together - son Cooper, 10, and daughters Tallulah, 7, and Willa, 5

Hoffman was farewelled at a funeral at ther Church of St Ignatius Loyola.

Investigators have been probing how Hoffman may have obtained the heroin. Tests of the heroin in his apartment have found that it was not cut with a dangerous additive such as fentanyl, a synthetic form of morphine used to intensify the high that has been linked to deaths in other states.

News_Image_File: Honoured ... Hoffman, pictured with Reese Witherspoon, won the Best Actor Oscar in 2006 for his work in Capote. Picture: Kevork Djansezian

A musician, veteran jazz player Robert Vineberg, has been charged with keeping a heroin stash in a lower Manhattan apartment amid the investigation into Hoffman’s death. Vineberg, who has said he was a friend of the Tony Award-nominated Hoffman, hasn’t been charged in Hoffman’s death and has said he didn’t sell him the heroin found in his apartment.

As police followed a tip after Hoffman’s death, they said they found about 300 small bags of heroin, worth about $10 apiece on the street, and $1,300 in cash in Vineberg’s apartment and music studio.

News_Image_File: Day out ... Hoffman with his kids Cooper and Willa in New York.